An efficient fluid cleaning system. Also provided are pharmaceutical compositions useful in such methods, compounds for use in the preparation of such pharmaceutical compositions, processes for preparing compounds useful in the practice of such methods, and some novel such compounds per se. The container contains adhesive material. The working key is modified each time the remote keyless entry device is placed in the training mode. The detection unit compares a first feature value of a first difference string and a second feature value of a second difference string.